Wow! You DO like it loud.
Here's some info. (I don't know your specs but here's some general stuff to work with)
You could increase the power to the speakers.
For a barely audiable 3db increase in loudness, you will need to double the power. i.e. If you now have 100 watts, you need 200 watts for a measley 3db increase in loudness. A 6 db increase would require 400 watts, a 9 db increase needs 800 watts, etc, etc.
Another alternative is more sensitive speakers.
If your current speakers have a sensitivity rateing of 87db and you drive them to a certain loudness with 100 watts, a speaker with a 90db rating would be able to reach that same loudness with 50 watts. Likewise, a speaker with a sensitivity rating of 93 db would only require 25 watts for the same level, a rating of 96 db would need 12.5 watts, etc, etc..
You seriously might want to explore Klipsch or other high efficiency speakers.